Air-pump.



No. 736,965] PATENTED AUG. 25,1903;

H., HARRIS.

AIR PUMP.

APPLICATION FILED APR. 21, 1902.

10 MODEL. 2 SHBETS- SHIIET 1;

we NORRIS PETERS co.. Mom-Luna. wnsnmcToN. u. c

UNITED STATES Patented-August 25, 1903.

PATENT OFFICE.

.HARRY HARRIS, OF WESTFIELD, NEW YORK, ASSIGNOR OF TWO-THIRDS TO S. FRED. NIXON AND EDGAR ROOD, OF WESTFIELD, NEW YORK.

AIR-PUMP.

SPECIFICATION forming part of Letters Patent No. 736,965, dated August 25, 1903. Application filed April 21, 1902. Serial No. 103,979. (No model.)

T0 on whom it may concern:

Be it known that I, HARRY HARRIS, a citizen of the United States, residing at Westfield, in the county of Chautauqua and State of New York, have invented new and useful I m provements in Air-Pu m ps, of which the following is a specification.

This invention relates to an air-pump which is more particularly designed for supplying air to a vaporizor for medicinal use, although the same may also be used to produce an airsupply for other purposes.

i It is the object of this invention to provide a simple air-pump of this character which has an operating mechanism capable of easy adjustment to suit the strength of the user and which has its plunger provided with means whereby the flange of the packing is reliably held in engagement with the pump-cylinder for taking up wear and avoiding leakage.

In the accompanying drawings, consisting of two sheets, Figure 1 is a vertical longitudinal section of my improved air-pump. Fig. 2 is a horizontal section thereof in line 2 2, Fig. 1. Fig. 3 is a vertical cross section through the operating mechanism of the pump in line 3 3, Fig. 1. Fig. 4 is a longitudinal section of one of the cylinders and the plunger therein, on an enlarged scale. Fig. 5 is a vertical cross-section of the same in line 5 5, Fig. 4.. Fig. 6 is a fragmentary View showing the joint between the ends of the retaining-band, whereby the' plungerpacking is held in a distended position. Fig. 7 is a cross-section in line 7 7, Fig. 6. 7

Like letters of reference refer to like parts in the several figures;

A represents the base of the pump, which preferably consists of a horizontal flat plate or board which can rest on the floor. Upon opposite ends of the base are mounted two barrels or cylinders B, which are arranged axially in line and have their inner opposing ends open, while their outer ends areclosed.

O 0 represent the plungers which are arranged in the cylinders, and D D the p1unger-rods connected with the same. Each of the plungers consists, essentially, of two clamping-disks c c, mounted on the respec' tive rod D, a cup-shaped packing having its body E arranged between the clamping-disks and its annular flange e bearing against the inner side of the cylinder and projecting toward the outer end thereof.

F represents an annular retaining-band which bears against the inner side of the flange of the packing-cup and holds the same against the bore of the cylinder. This band consists of a split ring, of flexible material, such as spring-brass, and is applied to the packing-flange in a contracted or strained condition, so that its resilience causes the same to constantly expand and press the flange outwardly against the cylinder, thereby causing the same to take up any wear and producing a tight fit between the plunger and cylinder, whereby leakage is avoided and the maximum efficiency of the pump is maintained. The ends of the split retaining-band preferably overlap one another, and one end is provided on opposite edges with two guidelipsf, which overhang the opposite edges of the other end of the band, as shown in Figs. 5 to 7, thereby permitting the ends to slide circumferentially one upon another, but preventing lateral displacement between the same.

In order to prevent the retaining-band. from becoming detached from the packing-flange, the same is provided with a number of guide pins or rods g, which extend radially inward from the band and are guided on the plunger. The guide for this purpose (shown in Figs. 4..

and 5) consists of a disk H, arranged on the plunger-rod adjacent to the outer side of the outer plungerdisk 0 and provided on its .margin with a number of perforated guide ears h, in each of which the inner end of one of the guide-pins g is arranged to slide radially. This means of mounting the retain- 9o ing-band on the plunger permits the same to freely'expand and contract, but compels the same to move with the plunger. The several parts of the plunger are held in place on the plunger-rod between a shoulder t' on the rod engaged by the inner disk 0, a washer t" engaging with the guide-disk and a screw-nut t bearing against the washer. i

The inner ends of both plunger-rods are secured to opposite sides of a reciprocating slide-block J, which is guided at its under side on the base and on its sides between two standards K K, arranged centrally on the base. Upon reciprocating this slide the plungers are alternately moved forward and backward. During the backward movement of each plunger air is drawn into the respective cylinder through an inlet Z, provided with a check-valve, and upon moving the plunger forward the air is expelled from the cylinder through an outlet l,containing a check-valve. The outlets of both cylinders are preferably connected with a storage tank or reservoirL, having an outlet Z from which the air is conducted by any suitable means to the place of consumption.

M represents an upright rock-lever whereby the plungers of the cylinders are reciprocated. This lever is pivoted between the standards K K and is provided at its upper end with a handle m, while its lower end carries a roller m, which is arranged in a recess'j in the upper side of the slide J. In order to confine this roller against lateral movement on the slide, the wall of the recess in the latter is provided with a groove j, which receives the edge of the roller. The edge of the roller and the groove j of the slide are preferably beveled or V-shaped, so that the roller is centered on the slide upon being moved back and forth by the lever.

For the purpose of permitting the leverage of the lever M to be varied to suit the user the fulcrum of the same is made adjustable for changing the relative length of its upper and lower arms. As shown in Figs. 1 to 3, the lever is provided on opposite sides with a longitudinal row of recesses or seats 11., and each of the standards is provided with avertical row or series of openings n. 0 0 represent pivots arranged in corresponding openings in the standards and engaging with corresponding seats in opposite sides of the lever. These pivots preferably consist of screws, which engage with screw-threads in the openings at and are held in place by jamnuts 07?.- By shifting the pivots from one set of openings and seats in the standards and lever to another the leverage may be varied without changing the position of the lever with reference to the slide.

My improved construction of air-pu mp furnishes a large supply of air with a small expenditure of energy, which is very desirable for invalids, because when placed on the floor the same can be conveniently operated by a person while sitting in a chair. This is especially desirable for persons who wish to produce an air-pressure for treating themselves with medicated vapors without the aid of an attendant.

I claim as my invention- 1. A plunger having an annular packingflange, an expansible split band applied to the inner side of said flange, radial guide-pins connected at their outerends with the expansible band, and adisk mounted on the front 5 side of the plunger and provided with perforated guide-ears which receive said pins, substantially as set forth.

2. The combination of a base, two horizontal cylinders arranged end to end on said base, plungers arranged in said cylinders, a slide connected with both plungers and guided at its under side on the base and provided in its upper side with a recess, a standard arranged on the central part of the base, and a lever pivoted on the standard and engaging at its lower end in said recess, substantially as set forth.

3. The combination of a cylinder and its plunger, a lever for operating the plunger, a standard arranged adjacent to said lever, and an adjustable pivot connecting the lever and the standard and capable of being shifted lengthwise of both of said members without disturbing the position of the lever relatively to the standard, substantially as set forth.

4. The combination of a base, a cylinder mounted on the base, a plunger arranged in the cylinder, a slide or block connected with the plunger and provided in its upper side with a recess, a standard rising from the base and provided with a vertical row of seats or openings, a lever arranged adjacent to said standard and provided with a corresponding row of seats or openings, and an adjustable pivot connecting the lever with the standard and adapted to be shifted from one to another set of coinciding seats in the lever and the standard, whereby the leverage may be changed without disturbing the position of 100 the lever relatively to the standard, substantially as set forth.

5. The combination of a horizontal base, two cylinders mounted axially in line on said base, plungers arranged in the cylinders and 105 provided with rods, a slide connected on opposite sides with said rods and having a recess in its upper side, standards arranged on opposite sides of the slide and each provided with a vertical row of openings, an upright no lever arranged between said standards and provided on opposite sides with a longitudinal row of seats, a roller mounted on the lower end of said lever and engaging with said recess, and screws for pivotally supporting the [15 lever movable from one set of openings and seats in the standards and lever to another for varying the leverage of the same, substantially as set forth.

Witness my hand this 17th day of April, 120 1902.

HARRY H ARRIS'.

Witnesses:

FLOYD HOLT, E. W. POWERS. 

